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L9924L Datasheet(PDF) 27 Page - STMicroelectronics

Part # L9924L
Description  Automotive vehicle conform truck car alternator regulator IC with LIN
PDF  84 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9924L Datasheet(HTML) 27 Page - STMicroelectronics

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L9924L
Electrical specifications
83
4.3.7
Pin "PH"
The PH pin is an input for the phase signal coming from alternator's stator output. The
internal comparator detects the presence of the phase signal when V(PH) > VPHTh. The
squared signal is forwarded to a period measurement unit that provides suitable timing data
to the µC to compute the rotor speed.
If the phase signal falls below the VPprTh1/VPprTh2 threshold the phase regulation request
(bit 12 of SPI register 0x13 is set [12.4.7]).
The device exits the stand-by mode when an activity is detected on PH pin (i.e.
V(PH)>VPHTh) independently on the status of other wake-up sources.
4.3.8
Pin "AUX_IN"
The AUX_IN pin can be used as auxiliary phase input signal in addition to PH pin. If not
used, AUX_IN pin must be tied to ground. It's forbidden to replace AUX_IN pin with PH pin.
Table 16. Electrical characteristics pin "PH"
#
Symbol
Parameter
Test condition
Min.
Typ.
Max.
Unit
1VPHTh
High voltage comparator
threshold
V(AUX_IN)=V(GND)
200
280
360
mV
2VPLTh
Low voltage comparator threshold V(AUX_IN)=V(GND)
120
190
260
mV
3tPSR
Spike rejection time
Analogue filter
-
30
-
μs
4IPpull-dw Pull-down current
V(PH) = 28 V
-
2
-
mA
5RPpull-dw Passive pull-down resistance
-
-
20
-
kΩ
6VPprTh1
12-V phase regulation voltage
threshold
[0x2].12 = SEL24V_EN=b0
7
8
9
V
7VPprTh2
24-V phase regulation voltage
threshold
[0x2].12 = SEL24V_EN=b1
20
22.5
25
V
Table 17. Electrical characteristics pin "AUX_IN"
#
Symbol
Parameter
Test condition
Min.
Typ.
Max.
Unit
1VAUXHTh
High voltage comparator
threshold
V(PH) = 1.150 V
200
280
360
mV
2VAUXLTh
Low voltage comparator
threshold
V(PH) = 1.150 V
120
190
260
mV
3tAUXSR
Spike rejection time
Analogue filter
-
30
-
µs
4IAUXpull-dw Pull-down current
V(AUX_IN) = 28 V
-
50
-
µA



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